// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_RESOURCES_MEMORY_HISTORY_H_
#define CC_RESOURCES_MEMORY_HISTORY_H_

#include <stddef.h>
#include <stdint.h>

#include <memory>

#include "base/macros.h"
#include "base/time/time.h"
#include "cc/debug/ring_buffer.h"

namespace cc {

// Maintains a history of memory for each frame.
class MemoryHistory {
public:
    static std::unique_ptr<MemoryHistory> Create();

    size_t HistorySize() const { return ring_buffer_.BufferSize(); }

    struct Entry {
        Entry()
            : total_budget_in_bytes(0)
            , total_bytes_used(0)
            , had_enough_memory(false)
        {
        }

        size_t total_budget_in_bytes;
        int64_t total_bytes_used;
        bool had_enough_memory;
    };

    void SaveEntry(const Entry& entry);

    typedef RingBuffer<Entry, 80> RingBufferType;
    RingBufferType::Iterator Begin() const { return ring_buffer_.Begin(); }
    RingBufferType::Iterator End() const { return ring_buffer_.End(); }

private:
    MemoryHistory();

    RingBufferType ring_buffer_;

    DISALLOW_COPY_AND_ASSIGN(MemoryHistory);
};

} // namespace cc

#endif // CC_RESOURCES_MEMORY_HISTORY_H_
